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/* gcompris - drag.c
*
* Copyright (C) 2006 Miguel de Izarra
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "drag.h"
static gc_Drag_Func gc_drag_func;
static int gc_drag_status;
/* Values of status are :
0 - waiting for a BUTTON_PRESS
1 - follow mouse pointer
2 - follow mouse pointer and waiting for a BUTTON_RELEASE */
static gc_drag_mode_type gc_drag_mode;
static GnomeCanvasItem *gc_drag_item;
static double gc_drag_offset_x, gc_drag_offset_y;
GnomeCanvasItem * gc_drag_item_get(void)
{
return gc_drag_item;
}
void gc_drag_item_set(GnomeCanvasItem *item)
{
if(gc_drag_status != 0)
g_warning("Don't use gc_drag_set_item during a dragging");
if(item)
gc_drag_item = item;
}
void gc_drag_item_move(GdkEvent *event)
{
double item_x, item_y;
item_x = event->button.x;
item_y = event->button.y;
gnome_canvas_item_w2i(gc_drag_item->parent, &item_x, &item_y);
gnome_canvas_item_set(gc_drag_item,
"x", item_x - gc_drag_offset_x,
"y", item_y - gc_drag_offset_y, NULL);
}
void gc_drag_offset_get(double *x, double *y)
{
*x = gc_drag_offset_x;
*y = gc_drag_offset_y;
}
void gc_drag_offset_set(double x, double y)
{
gc_drag_offset_x = x;
gc_drag_offset_y = y;
}
void gc_drag_offset_save(GdkEvent *event)
{
double x, y, item_x, item_y;
x=event->button.x;
y=event->button.y;
gnome_canvas_item_w2i(gc_drag_item->parent, &x, &y);
gnome_canvas_item_get_bounds(gc_drag_item, &item_x, &item_y, NULL, NULL);
gc_drag_offset_set(x - item_x, y - item_y);
}
gint gc_drag_event(GnomeCanvasItem *item, GdkEvent *event, gpointer data)
{
switch(event->type)
{
case GDK_BUTTON_PRESS:
if(gc_drag_status ==0 && event->button.button == 1)
{
gc_drag_item = item;
if(gc_drag_mode == GC_DRAG_MODE_GRAB)
gc_drag_status = 2;
else
gc_drag_status = 1;
gc_drag_func(item, event, data);
}
break;
case GDK_BUTTON_RELEASE:
if(gc_drag_status == 2)
{
gc_drag_func(gc_drag_item, event, data);
gc_drag_status = 0;
gc_drag_item = NULL;
}
else if (gc_drag_status == 1 && gc_drag_mode & GC_DRAG_MODE_2CLICKS)
gc_drag_status = 2;
break;
default:
break;
}
return FALSE;
}
gint gc_drag_event_root(GnomeCanvasItem * item, GdkEvent *event, gpointer data)
{
switch(event->type)
{
case GDK_MOTION_NOTIFY:
if(gc_drag_status > 0)
{
if(gc_drag_status==1 && gc_drag_mode & GC_DRAG_MODE_GRAB)
gc_drag_status=2;
gc_drag_func(gc_drag_item, event, data);
}
break;
default:
break;
}
return FALSE;
}
void gc_drag_start(GnomeCanvasGroup *root_item, gc_Drag_Func function, gc_drag_mode_type mode)
{
gtk_signal_connect(GTK_OBJECT(root_item), "event",
(GtkSignalFunc) gc_drag_event_root, NULL);
gc_drag_func = function;
gc_drag_status = 0;
gc_drag_item = NULL;
gc_drag_offset_x = gc_drag_offset_y = 0;
if (mode == GC_DRAG_MODE_DEFAULT)
gc_drag_mode = gc_prop_get()->drag_mode;
else
gc_drag_mode = mode;
}
void gc_drag_stop(GnomeCanvasGroup *root_item)
{
if(gc_drag_status>0)
{
GdkEvent event;
event.type = GDK_BUTTON_RELEASE;
event.button.x = event.button.y =0;
event.button.button = 1;
gc_drag_func(gc_drag_item, &event, NULL);
}
gtk_signal_disconnect_by_func(GTK_OBJECT(root_item),
(GtkSignalFunc) gc_drag_event_root, NULL);
gc_drag_func = NULL;
gc_drag_status = -1;
gc_drag_item = NULL;
gc_drag_mode = 0;
}
void gc_drag_change_mode (gc_drag_mode_type mode)
{
if(gc_drag_status != 0)
g_warning("Don't use gc_change_mode during a dragging");
else {
if (mode == GC_DRAG_MODE_DEFAULT)
gc_drag_mode = gc_prop_get()->drag_mode;
else
gc_drag_mode = mode;
}
}
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